反应详情

Under argon atmosphere, a solution of N-methyl-N-methoxy-5-bromopyridine-3-carboxamide (3.70 g), 4-methylphenyl borate (2.26 g) and potassium carbonate (4.17 g) in toluene-ethanol-water (100-10-10 ml) was stirred at room temperature for 1 hour. To the reaction mixture was added tetrakistriphenylphosphinepalladium (0.52 g), and the mixture was refluxed for 16 hours and cooled to room temperature. The organic layer was washed with saturated sodium chloride solution, dried with magnesium sulfate and concentrated under reduced pressure. The residue was separated and purified with column chromatography (ethyl acetate/hexane=1:2→1:1) to give N-methyl-N-methoxy-5—(4-methylphenyl)pyridine-3-carboxamide (3.97 g) as yellow oil.

1. temperaturethe mixture was refluxed for 16 hours
2. washThe organic layer was washed with saturated sodium chloride solution
3. dry with materialdried with magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was separated
6. custompurified with column chromatography (ethyl acetate/hexane=1:2→1:1)